osdev.org
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OSDev.org is a community-driven hub for operating system development, offering the OSDev Wiki and forums with tutorials, documentation, and discussions on kernel design, low-level programming, and concurrency topics like synchronization and threading.
More resources on Concurrency
CS140 Concurrency Notes (Stanford)
Lecture notes and resources
Operating System Engineering
Learn concurrency in operating systems with this course by Frans Kaashoek. Explore OS engineering principles at MIT OCW.
CS162: Operating Systems and Systems Programming
Explore concurrency and systems programming with UC Berkeley's CS162 course, taught by Ion Stoica et al. Build powerful, efficient operating systems!
Operating Systems: Three Easy Pieces
Learn concurrency in operating systems with this course from Remzi & Andrea Arpaci-Dusseau, based on "Operating Systems: Three Easy Pieces."
The Art of Multiprocessor Programming
The Art of Multiprocessor Programming - A book resource
geeksforgeeks.org
GeeksforGeeks is a programming education site offering tutorials, articles, and practice problems on computer science topics, including extensive coverage of concurrency with guides on multithreading, synchronization, and language-specific APIs plus code examples.